we talking about different benefit. if ur main can solo Experts, u use alt to host, and main join to take MVP platinum chest. abit of different to getting gold chest.
it fast and reliable way to farm SR weapons for both weapon grid and skill fodder because it highest chance from platinum chest. also no need to fight other people for MVP. there lot of crazy account out there now ...
but u bring up good point, alt should use gunner class to host and stack Snatch for main for more chance too!