In the short term, yes.
In the long term advertising companies will notice, that they are losing way more money than they gain by advertising on Reddit, thus stopping advertising on Reddit. This in turn means significantly less income for Reddit.
So by oversaturating ad clicks you will hurt Reddit in the long term.
Probably how many people clicked on what url. There are probably some information about those, the more trivial would be from where in the world they are and how they got there (following a link, being redirected or having entered it manually)
More complicated stats would include estimated age, gender etc, if available