Edit: So....T2 runes not worth buying?
Runes are designed to be cheap and useful for their range. They're not completely worthless, but I wouldn't invest in them.
If I may, once you find a few champs(or types of champs) you enjoy, look up some Rune pages for them. Save what you need and use the rest for champs. Over time, you'll find you like certain types of runes for certain match-ups, etc and may have several pages for 1 guy.