There is an old tried and true saying, "you got to pay to play". In audio, that is true too but more like, "the harder you play, the more you pay - up front or at the end of the day".Cheaper doesn't necessarily mean bad...plenty of quality budget amps out there...
Typically a higher price tag includes better components, warranty, and customer service...at least from reputable brands
I'm a proponent of running better amplifiers with gobs of power at 2- 4ohms where most amplifiers, cheap or otherwise, do a better job of stress-less amplification. Not an option for everyone, but like I ssid, I've paid to play, many many times before. This last time, I just saved up and got what I needed, found a great Korean deigned 3K amp that puts out 1000 watts at 4 ohms all day long. Here's hoping that I wont have to pay anymore for that.
That said, the amount of inexpensive, very high-powered decent build quality amps from brands like Stinger, Recoil, NVX, Taramps is really outstanding. I would have given my left nut for a 500 watt amp back in 1980 for ANY amount of money (well, you know what I mean).