DON vs SNG

OK, gonna try and work this out, so bear with me.
PokerStars "Double or Nothing" Sit and Gos are 10 seat, and pay each of the top 5 places 20% of the prize pool. The payout for a standard 9-seat SNG is 50/30/20.
But let's take a closer look. The entry fee for the cheapest DON is $1.10. So, we're not talking 100% Return On Investment, which is what you'd expect from a 'double-or-nothing'; we're looking at 2/1.1 or about a 81% return[1] when you win. Regular micro SNGs aren't any better: If you cash every time, you're looking at 1.8/1.2, which is only a 50% return. Getting heads up is better: 125%, and winning knocks it out of the park -- of course -- at a 275%[2]. But frankly, the higher numbers are irrelevant; we're looking at 81% for 1/2 the field vs 50% for 1/3rd.
It seems, then that the DONs, at least at the micro-levels, are the better bet.

[1] That's for the turbos, the standard DONs are 2/1.15, or about 73.9% return.
[2] Again, that's assuming 9-handed tables. The return values differ slightly depending on the actual number of players and individual tournament's payout structure, of course.