ROI is very hard to calculate for the people who visit this site. If people treat their tinkering time as leisure, rather than work, then the out-of-pocket costs for their projects become the baseline upon which to calculate ROI.
Look at AC Hacker's geothermal system. If he tallied his out-of-pocket costs and compared his alternative to a professionally installed system and to a natural gas system, his numbers are going to be quite attractive.
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