My collecting life in a sentence.
I would also add the non-rare items that get seriously expensive (just try to get a first-press Maiden, Metallica, Savatage, Virgin Steele, etc for a cheap price).
Something also worth mentioning is the craziness relating to shipping costs.
Unless you're buying a rare record on bargain it became forbidding to buy a single lp from abroad.
A 15$ record ends up costing you 25-30$