I completely agree. Instructing is fun at first, but it grinds you down as you approach 1,000 hours, then you realise you are never going to be able to have a decent quality of life on £25,000 a year, let alone pay any debts off. You will also realise that once you get 500-1000 piston hours, any more is a waste of time. No-one in the industry gives a t*ss about how many you've got.
Instructing can be great fun, but unless it's mixed in with charter/other work, it's a hobby that pays a little bit.
No holidays, no pension, always working weekends, no security, endless 0.5 hour trial lessons, always knackered, weather cancellations etc.
Sorry to be so negative, the industry shouldn't be like that, but it is.