I'm not sure what this has to do with our product choice but I find Global truss to be difficult to use, the lacing braces do not line up correctly end to end and their spacing means many moving lights with half-coupler clamps can only be mounted in specific places.
If you can recoup a truss purchase in 5 rentals you have better paying clients than we have.
Rereading that I was less than clear.
1 - I was quoting your post and addressing Nathan
2 - The 30% is the premium of the Tomcat over buying the Global
3 - The 5 rental criteria is doing 5 jobs and cross renting the gear from another shop. If you cover your costs and labor then it is time to start talking about buying it.
My intention was to stir the thinking that the funds are best left for working capital instead of being tied up in steel and aluminum that he hasn't needed much to date.