While the transaction accelerator works, you shouldn't rely on it all the time. That would be disrespectful to people who have more serious problems and need to get transactions through, because all they do is get your transaction into the next block that their pool mines and they can never increase the number of transactions that actually get into the block - so the transaction accelerator is essentially out of their own generosity.
No; the network right now is no more than 7000 unconfirmed transactions here and working in very satisfying way. So if anyone wants to do any transaction is very good option to do it now. On the other side if there is no hurry there is no need someone to pay the proposed 200sat/byte but he can spent his coins in a reasonable time paying less than the one third (60sat/byte). Therefore nowadays the fees are not high.