Hm...so with all that hype about TST I had to check it out myself. here are a few comments (FWIW)
First I do not quite understand your business model or rather the type of ideal trader you are looking for. I would think you'd love a guy who is profitable 4 out of 5 days per week scalping stuff like treasuries, crude, the minis, whatever. Like doing 10-50 trades per day with 5-50 cars per clip in the interest rates or 1-5 in more volatile stuff.
Low variance, consistent income if he's good...let's call it propshop material.
Those guys don't have huge swings in their equity curve like a guy who does 2 trades/day on average or blow up like swing traders caught in a limit move in the grains.
But how do you want to attract those guys with the current infrastructure you provide??
Your round turn costs are around 4-6$ so forget about shaving the 5yr for a tick or two, even the 10yr cant be traded on a short term basis.
I once had a little fun with a T4 demo for a week and averaged 140 contracts/day trading a 5 lot clip in ZF/ZN/ZB/UB...500$ + in fees per day?? No thanks!
So at least add commission tiers based on volume so scalpers have something to work with. Otherwise every profitable trader will run away using his track record to apply to real prop shops like ARB or Propex or shop for cheaper rates. Even at a 50/50 split he makes more if he trades at even 50cts round turn.
Next problem is your platform choices. Of course you love that Ninjatrader affiliate deal, but the only really usable frontend for high volume traders is T4. Everything else is just not usable cause it's relying on that crappy rithmic feed or costs a fortune in licencing fees upfront. And when anyone wants to use T4, you top it up with 1$ per RT...great. What about offering CQG or the new TT platform, even if it costs a monthly base fee?
So to be honest, I registered for your free trial just to check it you, but once I realised that I have to use NT I just gave up and wont look at TST again.
TL;DR: if you want to make money with fees, keep it that way. If you want to make money from a couple of guys who consistently clear 6 figures a month and trade size, do something to attract them. Lower rates for higher volumes (even if you don't advertise them) and decent, stable platforms besides T4. In exchange I think even a 40/60 split with 60 to the trader would be acceptable.
P.S.: Here's what I would do if I was interested in scalping futures. I'd buy the 50k combine and scalp my way up to the funded account, cash in the 5K and leave asap using your admittedly great reporting tools as a trackrecord to apply for a position at a propshop...and honestly, that's probably what SebastianXP from Germany did...when he did the math
I know that sounds like a rant but really it isn't. TST is a great opportunity for everyone, especially in countries that have no trading culture or infrastructure, also for the small guy who has no PhD and no chance to weasel himself into a trading position abusing his ivy league pedigree.
But on the other hand you need to make money too and from my understanding you ring the register by charging above average fees...and that's also ok if this is your business model.
But IMO you are making the same mistake as 70% of all shops out there: 1 out of 100 gets a funded account, 1 out of 300 is probably keeping it and makes money, 1 out of 500 probably can make a small living from trading with you and 1 out of 1000 will make it big.
Of course you cannot count on luck and wait untill the big swinging dick arrives, but if you are not even able to offer those guys a decent playground the chance that he's not coming to you is 100%