if you can't be profitable on 1 contract, you won't be on 25.
Yes given a scaling plan, that's understandable. As I am all in all out, it's not relevant.I agree unreservedly with this. If you can't be profitable trading small, then you certainly can't be profitable trading big, either.
That said, and acknowledged, I did find the point at which I eventually managed to move up from trading 2 contracts to trading 3 very beneficial, and it felt that things became easier from there just because of the ability to scale in and out of positions, add to winning positions, etc. Some of it might be attributable to a modicum of "additional experience", of course, but in the three months after switching from 2 contracts to 3, I did almost 80% better (i.e. rather than the 50% better one would expect pro rata simply from the bigger position-sizing) than in the the three-month period before that.
I see many people making supplemental income from having been successfully funded by TST and some making a full-time living from it,

So you are either a TST insider or you get your info from their chatrooms.
Both are fine, but please knock off referencing Youtube, when you are clearly not up to the challenge to show us just 3 such videos...(and I obviously don't mean Newly Funded Trader videos)
For the last time, here are some numbers that would be actually meaningful but still keep anonimity:
1. Average earnings of their top 5-10 traders. (this would indicate just how high one can go)
2. Number of Live traders who earned at least 10K. (this would indicate traders who are much better than breakevenish)
3. Max. number of contracts used by the top earners. (this is not so relevant, but indicates max. leverage)

And what do you say to the $95 per month charge for the $10k Combine, which includes the $85 per month CME data-feed fee? Do you begrudge them even the extra $10 for that one, or is that one an exception?
None of these numbers are meaningful to your or my trading,
Don't you remain a non-professional while you're using a simulator, and only graduate to the high professional fee once you actually start trading?