Sometimes being a developer really sucks. I adopted a heavily customized OXID shop which introduced an ingame currency beside the fiat currency.
It was done by introducing $iPriceChannel and replacing the $dPrice float value with a multidimensional array across all components, controllers and models.

Wait ... not 100% of the code has been "adapted" yet but it's sufficient to get it working at the first glance.

The reality is: The shop has many subtle bugs and piles up huge (error) log files.

Every time when a bug was found,
and every time the shop maintainer is unlocking an OXID feature which hasn't been used yet, I have to fix it.

It's even extra hard to fix issues sometimes because the shop is embed in a game by utilizing a content-aware reverse proxy. My possibilities to navigate through the shop directly is limited because some of the AJAX/CSS/HTML elements doesn't work without loading this game.