Good points, TN. Your opinion counts. Here's mine: My feeling is that the s30 Z car market is so small, as a percentage of the car hobbyist market, and any information is appreciated. I don't expect every aftermarket component made in a cottage workshop for my 30-year-old car to be completely FEA'd and racetrack-proven. So many of the new "ideas" and well as "plans" (my words, not marketing verbiage) are posted for the purpose of being free either here at HybridZ or on personal sites, and I'm happy to pay for the time and talent of machinists, welders, fiberglass sculptors, and experimentors who put things together for a price that the market determines.
Some "free plans" examples off the top of my head:
R-T rear diff mount
P-P frame rails
A handful of rear disk brake caliper bracket designs
crossmember to mount finned R-200 rear cover
KA24 5-speed adapting
Honda A/C blower and wiper motor swap
Any of these could (or did) evolve into a business venture if someone wanted to tool up and manufacture parts for those of us who can't.
Therefore, I don't see HybridZ.org being abused as an advertising medium, and no need to police or stop the trend you have noticed.
Thankfully, and largely due to HybridZ, I also know that I don't need short shifters, coil overs, aero dams/skirts/wings, neon and stickers.... (insert youth-targeted FAD here)... to make my cars run better.