What blows one team's budget is entirely manageable for another. If I have the #1 or 2 pick in a draft, I'm going to want at least $18M and probably $20M in HS or COL. If I'm picking 30th, my "sweet spot" might be $6M and hope I get one marginally decent player out of the draft. If I have money to compete for the best 2-3 IFA that come along, I'm going to want $18-20M in IFA if I can manage it.
Although we don't know this 100% for sure after the update, logic says every $1M increment will give you "better accuracy." I'd imagine that 4-5 months from now there will be enough data that people will have a good guess rather than pulling numbers out of their behinds and treating them as jewels. Until then, if someone gives you a specific answer for where projections become accurate enough, turn your bullsht meter all the way up.