It is very much a YMMV situation, but I think most posters on this thread are not particularly creative when they come to hotel bookings.
To give a simple example, I was looking for a hotel in Hobart for two nights over a weekend in the coming months.
A popular weekend, so half-decent hotels were going for $350+ per night and the good places were going for $500+ per night (including the Crowne Plaza).
Someone would use their $100 voucher to bring their $700-1000 hotel cost down to $600-900 and think they got a bargain.
I bought 74K IHG points for $AUD478 and got a room at the Crowne Plaza for $AUD240 per night. Even better, as I booked directly rather than through Qantas hotels, it will give me a chance to test run my complimentary Platinum status with the Chase IHG Premier Business card
.