I am probably wrong, but my theory is that even hardcore users realize that when it comes to modeling, Houdini is (at the moment) in pretty bad shape compared to the competition.
… same could be said for the competition being in pretty bad shape for FX.
If one has no problem with MOPs, Direct modelling HDAs…then there should be no problem in using a second, third, fourth , etc. piece of software to accomplish your goals, if the current software your using is not meeting your needs.
You'd have to qualify ‘modeling’…because I use to be a SolidWorks user and print 3D organic models.
I just recently did a job that took me about 30% more time to finish, compared to how long it would have taken in Solidworks.
But that 30% more time was for the most part, working out a tool for future projects.
My next job will take about the same amount of time as in SolidWorks. Not only that but because I spent time on the tool I'll be able to do complex models that I could not do in SolidWorks; due to it being a ‘black box’ type of software;
In other words, software that has all the tools for you…up until you run into that wall in which there isn't even a workaround let alone ability for you to make your tool to get the job done.
And at $300 vs. 6k…it's a nobrainer.