$2500 savings for 150k miles.... Sure, maybe not a "terrible" tradeoff, but I'd go at least as far as "bad tradeoff." You're getting less than 1.7 cents per mile, even if you completely discount the ~8000 miles (each!) given up by flying non-rev.

If it's what you'd like to do, it's perfectly reasonable. Just keep in mind it's possible to redeem miles for a LOT more value (even on coach tickets).