Hot-boxing is okay if you are playing an hour here and there up and down the country - you can't do it if you are playing six hours solid regularly at a local night (av 3 mins a track, 20 records an hour x 6 = 120 records a night) - you need a fairly wide and extensive collection to carry that kind of thing off or else you'd be stale in a few months.
Add in the fact that you should be tailoring your selection on where you are playing, how you feel that week, what time of the year it is, whether you think it's gonna be a humdrum night attendance-wise and need working a bit or whether it's gonna be busy etc etc
Yes, you always need new sounds to keep it fresh but there's that much good, playable stuff out there that won't break the bank it's do-able without moving stuff on (and yes, I understand that hot-boxers are generally scene-led and they are big ticket items but you get my drift I hope!)