Most of them don't even have any money and I mean literally. Can't tell you how many cheap charlie Russians I've met over the years, particularly in Laos. One guy I picked up on my drive from Pakse to Bangkok at the border (I was being nice) argued with a Lao border official over a 40 Baht overtime fee. I probably shouldn't have been so kind as to give him a ride, when I saw him at the border, but I was heading in that direction anyway. At a gas (petrol) station rest stop somewhere around Sri Saket, he was very reluctant to fork out a mere 49 Baht for a plate of fried rice. I personally almost never spend that little on anything; 49 Baht is an absolute bargain for lunch, I consider a cheap meal to be around 200 Baht per person including a soft drink or water. However, in that part of Isarn, there's really nothing; if you stick to the main highway between Chong Mek and Si Khiu in Nakhon Ratchasima (highway 24), you have a handful of PTT stations, most of which only have Cafe Amazons, some basic no name Thai food and not even a Black Canyon. Yes, there are a couple of Lotus's with MK restaurants in places like Nang Rong, Buri Ram, but when I'm on long road trips, I generally don't like to waste time by stopping off at shopping centers as that consumes too much time.
At the Chokchai steakhouse where I stopped for a steak dinner, he said it was "far too expensive" for him, preferring to smoke a few cigarettes while waiting outside for me to finish my meal. He never offered a tip or anything. A bus ticket between either Pakse or Chong Mek and Bangkok, would have cost somewhere around 1000-1200 Baht. He spent 49 Baht on fried rice, I think he got the deal of a lifetime.
On another occasion prior to that near Tha Khaek, a Russian couple were hitchhiking and I picked them up. We saw a few caves together and then I dropped them back off along the highway, after which I continued towards Savannakhet, my destination for the day. Again, they didn't spend even a nickel, though they were very thankful for me taking them around. I understand they tried hitchhiking their way towards Vientiane that evening.