Strange, I didn't recall my character creation starting the toon as a lv 58 ready to walk through the portal. There was no option to pay for it back then either, how peculiar. At the end of the day, both leveling, rep grinds and attunements were very much the "tbc experience". The current boost will net you hours not having to level. If they offered attunements for $10, it would practically be of little difference in the result. Both are there to save a time gate.
Can't buy gold (yet) in Classic with irl money.