Well, it does make sense to me that a scout is self-sufficient compared to eg. pioneer who needs to be provided with food and resources. So even if we fix the scout salary regardless of his level, I think 20-25 gp/t would be adequate. I can see the reason being the same like it is for a scout to get a raise; a sargeant (lvl 2 soldier) or a colonel (lvl 3 soldier) would be more useful and would deserve a higher salary. For gameplay simplicity I wouldn't do this though. I only pointed out that for the sake of consistency it would be correct to do so if ever scouts would be applied this scheme. Because both unit types do level up. I prefer a fixed salary for both scouts and soldiers regardless of their level. I also agree that soldiers are harder to maintain when "deployed".