Well....I've made it a practice to keep my opinions to myself here at Audiokarma, however, I feel this is an unfair judgment against a fine person.
Like Retro, I buy and sell gear off of ebay. In fact, his example was an inspiration to me when I first started my ebay business (offering a warranty on the product, excellent pictures and description). So, let's walk through an average transaction from start to finish to see what all it entails.
John Doe finds an amplifier at a yard sale for $10. Without the knowledge or ability to properly test it, he list it on ebay for $100 just like he found it (this is a proper definition of a "gear flipper"). His listing has one fuzzy, little picture and states that the amp is sold "as is" with no returns. Upon searching his previously sold items, you notice that the heaviest item he has sold to this point was a beanie baby. Hence, a huge crap shoot on his packing abilities. Feeling lucky that day, you pull the trigger and pay the seller within minutes with Paypal. Several days pass without hearing a word from the seller. After a few unanswered emails you finally get word that the amp was shipped (usually without tracking information).
A few days pass and it finally arrives. You lift the package and feel the amp rattling around inside. Upon opening the package, you feel a great sense of relief that it arrived without damage. Another bullet dodged. Typical with 30 year old equipment, the unit is covered in grime. You remove the cover, blow the dust out, and hook it up on the bench. It powers up, but, has no sound (again, typical with 30 year old gear). After an hour or two of troubleshooting, you determine the parts you'll need to get it up and running. After extensive searching, your able to find that "out of stock" part needed (these parts are above and beyond the mandatory replacements of the caps in the power supply and protection circuits). You then gather the unit up and set it aside for the week or two wait for the parts to arrive.
The parts arrive and the real work begins. After several hours of replacing the defective parts, cleaning the switches and controls, adjusting the bias and offset, you have the amp running at peak performance. It sounds wonderful, but, you know your work has just begun. You remove the faceplate and knobs and start the cleaning process. Again, several hours later, you have the unit looking as good as it sounds. You then insert it into your own system and enjoy the fruits of your labor.
Wishing you could keep every piece of gear you restore, but, knowing that is an impossibility, you list it on ebay for what seems like a ridiculous price to those unaware of the process it took to get to this point. You receive several insulting emails from ebayers complaining about your price and offering you the original $100 you purchased the item for. Trying not to let it get you down, you stand firm on your price and you offer a warranty and guaranty it's safe arrival, eliminating any risk to the future owner.
So, lets look at what it took to get it to the "flipping" stage---
1) The risk and mental anguish involved in receiving the unit in a reasonable enough condition to restore.
2) The possibility the the parts needed are unobtainable.
3) The hours it took to repair and clean the unit. (You laugh to yourself when you realize you made less that minimum wage, but, know in your heart that money is second to your love of the equipment).
4) The time involved in photographing and listing the item.
5) The time and expense to properly pack and ship the item.
6) And finally, the responsibility of standing behind your product.
So, in the end, you've turned a $10 non working junker into a piece of audio equipment that someone will enjoy for years to come. What better audio "karma" is there? Then, you repeat the process again and again because the joy you receive far outweighs the minimal financial gain you might have acquired. Remember, it's all about the music!!!
Craig