ethics - Is it ethically unsound to accept a graduate admission offer then later withdraw?

Note: Similar questions exist on ASE but those pertain to funded programs.

I have been admitted to an outstanding MS program and waitlisted for admission to another outstanding MS program. Both are unfunded. The first's response deadline is 04/15, and the second said they may not be able to let me know the final decision before then. While the first program is outstanding, I find better fit in second program (mainly research interest, location, and tuition rate). My question is: would it be ethically unsound to accept the first offer prior to the 04/05 deadline, and if I find out thereafter that I am accepted to the second one, decline the first? Since there is no funding involved (as in a Ph.D. program) I would not feel as bad about it.