I think like most things the amount of use really determines what you should do. If you are going to ride outside most of the time, and just want an indoor option then a trainer is a great choice, but if you are going to be riding daily, spend the extra money and get a real spin bike.
Or buy a cheap training wheel and a $400 power meter and spend like $100 on the trainer.
Why spend more for a spin bike when you can use a real one with just as good or better power controls and feedback?
Point is Peloton is expensive indoors or out...
I destroyed a Conti GP 4k II on my trainer this winter too because I was running it around 80 PSI. When I noticed how destroyed it was I did some googling and learned that on the trainer you should really be using the max PSI supported by your tier (i.e. 115-120).
I ended up getting a trainer tire to put on a spare wheel and have been happy with that so far. But if you run a hard tire like Gatorskins, those seem to be fine at a high pressure. Any sort of racing tire will definitely be used up quickly regardless of pressure.
A tip I got from someone is to switch your rear road tyre for a special trainer tyre so you don’t have to worry about wear-and-tear. Something like this:
http://www.wiggle.co.uk/vittoria-zaffiro-pro-home-trainer-ty...
With smart trainers this is no longer a thing. They can more reliably control the resistance to mimic the elevation percentage and rolling stop/downhill feel. If you are serious in anyway about riding there is no reason to not have a smart trainer at this point.