Generally yes, but it doesn't take a lot for a deal to go south (bad).
I generally buy cheap from ebay because i know that things occasionally happen, so what we want is to buy cheap and not hope to sell it ridiculously higher. ie. buy low sell high. Not buyer higher, and sell even higher.
For example, I bought about 5 x CL in the past 1 year, one was completely frozen, nothing could turn, shutter, back etc, only the 40mm cron was salvageable. However, since i bought it at a price of a cron, it didn't matter.
Take the case of the frankenstein M2, everyone was warning me not to buy it. It was in good condition but the risk was there that the whole m2 would be a dud, ie. the seller rating was like a dismal 92%, the photos were small, and the description had alot of "I don't really know...". What I did was to call the seller, spoke to the seller, asked questions and warned him that it if was not what he described, I would be seeking to get compensation and give him a bad rating; in the end I pulled the trigger. The camera was what was described and now a feller CSer is a proud owner of the M2.
There are bargains on ebay, some of it has to do with folklore and usability, for example, the price of the canon f1.5 is around 550 usd, the f1.2 is around 600+ and the f0.95 is around 2k usd. But the f1.4 can be gotten less than 250 usd. The f1.5 lens is a sonnar design but the f1.4 is very very good too, i like the chalky look of it.
"Zain. Captured on the M4-P with the Canon f1.4 with yellow filter"
But wait...the Canon f1.8 is the poor man's summicron, this lens has been praised by Dante Stella as the best 1.8f ever for Leica LTM. This lens can be had for between $99 - 150. But hardly anyone talks about the f1.8.
Roll#163 Film is Plusx100 souped in Microdol-x STAND (cause of the halo effect)
Leica CL with Canon18
Here's another example, i bought a beaten up Canon 35/3.5f for 41USD, the CLA was 80SGD. Net net, it cost be 120. Was this a bargain ? I am undecided. P&G who CLAed it says its beautifully restored.
Roll#273 Plus-x Diafine, Frankenstein m2 with Canon 35/f3.5
so bottom-line is, there are bargains but it is a bargain for a reason, if the reason is cosmetics, it is probably okay.