PRO to EXP for $4,375 or 437.5K miles.
I'm currently a bit over 150k LPs, but Phase 1 of my match/challenge ends the day after tomorrow and I'll roll into EXP then.
Seriously, though...that's $0.10 or so per LP. No wonder AAdvantage Hotels is erroring...anyone with two brain cells would just pull a few reservations there. It might actually be cheaper to pay off a fleabag motel owner to run a "bargain" than to pay that.