some domestic tickets are worth using 25k miles for.

ski areas like flying to ASPEN or WHISTLER/BC can be high cost tickets in mid winter. I saved $700 flying to CO and $500 flying to BC. No, wait, make that $1,000. I used a UA account with 50k in it to get us both 25k tickets and he in turn paid for my ski pass for the entire trip out there. While there are taxes, they are often very low and in these two cases, it was far worth using miles over CASH.
MM