I'm a funded trader (although it's under a hole right now and trying to recover slowly, lol) and I found TST to be fairly helpful in my learning process. I did blow at least $2K or so after blowing many combines then FTPs and I did blow a funded account before as well so to be fair, they lost enough from that account to be that much profitable from my combine purchases ;p
Here's the thing, blowing $2000 with the learning experience (especially learning that I HAVE to manage risk or I have to restart) is far less losing than starting my own account with $5k, $10k or more than blowing those up. I mean, with futures you can lose $2000 in a single trade if you don't know what you are doing.
If you find yourself constantly losing and resetting, there is a lot to be said about your trading method(never start with more than 3 contracts until you build some cushion for the 'day' as that's pretty much where you start anyway for FTP and funded account) . What I did was test out a method in replay mode, start a combine to see if I can pass, if it fails, analyze why (did I make too many mistakes? emotional? simply no edge to this method over the long hall?) and repeat. You can probably do this simply on sim but I prefer having some skin in the game to keep motivated and analyze my emotions.
I rarely reset my account because I would rather take some time off as punishment for not following rules or simply rethink about the strategy if I failed. If I failed, it just means I can fail again in the funded account to right? Why repeat the same thing and expect different results?
Some thoughts. $50k combine is the best bang for the buck if you are going for it. Don't ever break daily limits, if you are, you obviously aren't looking at risk properly for every trade you make. Don't just blindly keep the combine fees going on monthly basis, I would either be done within a month and move onto FTP (at least FTP is free to keep going) or pause after a month to see if I'm doing okay before paying again. If my account has negative balance, why pay monthly fee instead of starting over?
Honestly, it's probably better to see if you can be profitable on replays before even trying. Otherwise, you are just throwing out money.