Assuming no jackpots, OR claim tickets are found...I'd expect a 65-70% return. There will be some garbage books that might offer a $200 return, but you will also likely find books offering a higher payout than the cost to balance out that average.
20 books = $12k. That means you could only get 9k back. The chances of hitting $1k on 50X The Cash is 1 in 5000, and 20 books = 1.2k tickets. However, I'm not factoring in the instant liability report or the potential "remaining" prizes here. The chances of hitting a jackpot may be much better than the advertised game odds due to how small the supply is. I believe they AK Kwik had 20 books of 50X The Cash (Jacksonville district office which is 1 hr and half from Gville had 10 as well).
If you buyout 200MS also, that would cost about between $6k and $12k. AK Kwik might have closer to 20 books, and there's a couple other food stores in Gaineville with 200MS books. Most of the 200MS books in Florida are in North FL, so if you were seriously considering buying out that game it would be worthwhile to have a list of stores to call up before hand so you can know with certainty you're snagging them all. They probably also have about 10-15 books of $200 MS remaining. The odds for 200MS look so good on paper, and we haven't seen a single 5k or 10k hit from anyone on our forum.
Anyway, I'm off to bed. Night!