Weirdly, the low-cost long-distance bus service in the UK has an option for food, drink, more reliably available wifi and better seating at not much more in cost if you're clever about it, in the form of Megabus/Citylink Gold. Its higher-cost competitor, National Express, stops at service stations on certain routes and provides vouchers for the cafes/restaurants there. (They also often make stops at large bus stations for upwards of quarter of an hour, allowing people to get food from surrounding shops.) And at times, you can get first class on the trains at less additional cost than the wifi would cost - with comfier seating, free wifi, multiple meals, and free alcohol.

I have a suspicion the issue isn't really the lack of service, it's that either you get nickle and dimed or the next step up is an order of magnitude higher in price.