As long as you keep it to a bit of fun then you'll be fine - I dont know what you earn etc. but if £20 is just a bit of pocket money to you that you dont mind losing and it gives you some enjoyment, then go for it. Its just the way you were talking earlier made it sound as if you were in it to make money, which I would strongly advise against!!
Its just some friendly advice mate - up to you if you take it
