1. Pay off current debts (est. 350,000 with my mortgage)
2. Build an elaborate gothic/victorian mystery mansion with hidden passages and various other secrets in a remote mountain location overlooking a small town (Budget 5-10 mil)
3. Setup accounts for managing my remaining funds for investing for return, various investments in small companies I personally like, donating to charity, and for living off of. All of these account should be setup in such a way that they can persist after my death without a defined next-of-kin (not really a purchase but I'm still spending money so w/e)
4. Continue to exist for a while, then hire a professional assassin to kill me in a very particular way I will have detailed ahead of time (est. Idk however the fuck much assassins cost)
5. The person who is able to piece together the clues I left behind in the wake of my murder will inherit my fortune. (note: this does not necessarily mean "solve my murder". I suicided by assassin, that'd be a boring answer.)

As for the "why", the only answer I can give you is because I would find it fucking hilarious