t tests are for testing if it is true that there is a specific difference (usually 0) between the two means. I guess you are assuming that there is a difference so you aren't trying to disprove that the difference in revenue is 0. If you want to show that once advertising scheme is better than another then that is a different test. Confidence intervals would be a better approach.
The analysis is a bit long winded and some people abandon their mathhelpforum accounts after a couple days so if you can confirm that you are still looking for an answer then I'll post the analysis.