I assume that spend per user is higher than console users, since most steam users spent about $1000 on their computer compared to $300-500 on a console. However, the population of PC gamers is probably a lot smaller than console gamers given the money and knowledge barriers to entry.
Alternatively, after having streteched their budget for a PC, many gamers may have less money for games to play on it. Also, many PC gamers simply play on a family PC, not some dedicated machine.
