I am only using this because I have a couple of ERC20 tokens where they can be only exchanged through Bancor. After that, I won't be using them again unless some of my "come back from the dead" tokens are only listed in Bancor exchange.
If you can transfer them to other eth supported tokens its better. I think you can used forkdelta or any dex to sell it but of course Im not sure whether there is enough demand for that tokens. Also you can used I think Uniswap, nothing can be done with their platform needs a lot of improvement. What tokens are you trying to sell by the way?
Yes because I don't think these tokens I've exchanged didn't convince me anymore about having a bright future. I have waited like 2 1/2 years for both of them to finally had a little breakthrough, but eventually it dumped slowly and never had any interests from new buyers anyway.
Both of these tokens are "dead" for 2 1/2 years before a little bull trap happened and it continues to dump slowly. I have no more reason to hold these tokens anymore, as I am going bullish on ETH.
From my experience, bancor is one of the exchange that requires exorbitant fee. In fact when you want to transfer or exchange a token to ETH you must be ready to deposit amount above the amount the network suggested for gas fee. In your own case, you said you only deposited the required amount for the gas fee not minding if that amount must have increased. My suggestion is that you deposit amount above suggested fee and re-try the transaction. Network congestion can happen at anytime so it doesn't matter if you didn't witnessed it when you make transaction from one wallet to the other
For my next conversion, the gas fee got even higher to $6.07. But I decided to convert it anyway, because I'm more bullish on ETH than these "tokens" where it took me 2 1/2 years of waiting for them to be converted at a reasonable price. So $5.49 + $6.07 conversion fee = $11.56 in conversion fees combined.
A small price to pay though, but not bad for some extra ETH so kind of a "win" for me, but $5 to $6 in conversion fees alone are kinda ridiculous. I could have earned a little more.