To save on expensive solvent, try this when cleaning up brushes. Find two cans with plastic lids, one can smaller and one larger. Pour the proper solvent in the smaller can to clean the brush. After cleaning, pour the used solvent into the larger can. The sediments will settle out in a day or two so you can reuse the clear solvent that will remain on top.
The depreciation factor can help you out when you buy more expensive quality tools. A high-quality tool usually will depreciate less, as a percentage of its purchase price, than a lower-priced tool. This means you can use that quality tool over the years and, if you resell it, you recover a higher percentage of its cost than with a lower-quality tool.