I mail ordered lots of Turbo and PCE games bitd. If it was as easy as it is today, I would probably have bought all of my games online. Of course, then used games sales would have hurt NEC/TTi.
Good point: the double-edged sword. NEC/TTi would have benefitted from greater (potential) reach of online sales...at least amongst the folks who were online. BUT, this would have been partially countered by the used game market (TurboList and BBS had active sales/trading via old-skool platforms without needing the fancy new browser + Internet).
Still, it seems that the "Internet era" (vs. brick-n-mortar distribution) would have been much more conducive to nurturing and supporting a niche console like TG-16/DUO.
STATUS: Really, we should be asking ourselves, "Why the heck did big retailers like ToysRUs, EB, Software Etc, etc. continue carrying TG-16 for as long as they did? Were they truly selling enough to justify the shelf-space? Did the fact that there were SO FEW places to purchase TG-16 items actually help the handful of vendors (because it made them the "only source"; de facto)?
When Saturn launched, I remember buying discounted games at TrU (Vasteel for $10). I was simply accompanying my friend as he bought new Saturn games and was shocked that TG-16 software was still in the damn building.