When I got my doe, she was a three-year-old rescue. Fist vet checkup revealed molar spurs; it was no surprise, as she wasn't cared for well in the past, and didn't eat much hay at all during the first month I had her.
I was rather concerned: both for her health, as well as the financial/time/QOL implications if I had to take her to the vet every two months to get her teeth sanded down... or, worst case, dental surgery.
I found a hay she loved -- orchard mixed with clover -- that she devoured. (Okay, she devoured the clover, but managed to consume some hay in the process.) It was the most expensive hay out there at the time, around $8/lb, but it was still significantly cheaper than potential vet dental bills. I stuck with it and bore the cost, hoping it'd get her teeth in better shape.
Next year's checkup revealed no molar spurs and great health, dental and otherwise.
This was just my single isolated experience, but I'd stress that hay is of the utmost importance to rabbits. Even if you need to spend a bit more to find (and keep buying) something they readily eat, it's the best choice you can make -- for them and your checking account!