I ended up 'cheating' by maxing out my money and then just buying all the things. While I understand your reasoning for RNG loot (which is ok), I don't agree with the RNG generated shop items. A shop should either have items or not have items. This allows the game developer to plan difficulty of encounters by knowing what the player has access to in shops as well as the potential average range of loot they could get from monsters.
When both loot and shop items are completely RNG then it throws any semblence of difficulty out the window and it becomes a matter of 'enter and exit the shop repeatedly so that the thing you want for sale is up for sale and you can buy it to overpower any challenge in the way'.
Gamers tend to follow FOSS (first order optimal strategy) and the FOSS for this game involves repeatedly entering/exiting/reentering and grinding as much as possible to get the things. I do get that Pavlovian conditioning has some merits but I feel that the use of RNG shops in this case ends up being more of a Skinner box style of manipulation rather than anything that increases enjoyment of the play experience (aka what game devs USED to talk about before everything turned to focus on monetization).
If this game could ever be remade in Unity (or RPGMaker) then that would be pretty awesome to see. Perhaps consider a crowdfunding campaign for it if you would like to do so. The entire game so far reminds me heavily of really old-school stuff like Rings of Power for Sega Genesis as well as some really old-school retro games I used to play. There's a market for that and the very unique aesthetic and many unique mechanics are something I feel would succeed in the marketplace.
Disgaea was not the first-ever game to have a lift/throw/stack mechanic for the battlefield. If we want to be TECHNICAL we could say that NIS games were the first to put them in an RPG (to my knowledge) but the first game with 'lift/throw enemies' mechanic that was actually popular would be Doki Doki Panic (aka Super Mario Bros 2 USA). So the Disgaea system is just a modified version of that. Maybe even going back to the arcade Mario Bros game of lifting/throwing enemies at each other.
Please do strongly consider not letting this game fade into obscurity. The story is intriguing and the gameplay/combat mechanics are nicely done! ^_^
EDIT: And don't worry; I'm making my own 'best items' lists for shop stuff and then I'll play without cheating. Since you have database access, if you could compile the info into a Google Docs or something and link it then that would be awesome. If not, then I can always do it myself (though slower) in a more manual method.