I work with a lot of recruitment agencies, to be fair there are some very professional recruitment consultants who earn very large sums of money-BUT you have to work very hard, have a thick skin, be able to sell and deal with pressure, but if you are good, I know some consultants who earn 70K a year with no education whatsoever. It is also relatively easy/cheap to set up on your own (should you wish to) further down the line.
Going into in house HR is a totally different kettle of fish. This is not commission based, you are simply matching CV's/people with jobs. It's more about knocking back agencies, being organised and knowing processes, as such at entry level the financial gains are not on the same scale.