The ML tools that I actually use are not available now is the short answer. The below is more of a a marketing concern.
TL;DR: Most members posting in the forum about ML now have an EXTREME level of sophistication. Not sure an average new member could get over the learning curve with the present price structure.
You might consider separating-out something like simple linear regression that is fast with few memory requirements. Something that is not expensive for P123, and basically make it free. I assume a linear regression requires just the memory of the coefficients for predictions.
Having said that, not sure why it takes so long for a ridge regression to run on your severs.
People using ML now have had the opportunity to try the beta. New members will have to be highly committed and be quick learners for it to work for them. Mostly it won't work for newbies
You might let newbies dip their toes into the water of machine learning. Allow for a bit of a learning curve.
Remember it took some of us 10 years to get comfortable with ML and some long-time members still do not believe in ML even after the beta (I am guessing). They could not get it to work for them in other words.
I can remember discussing whether to use a t-test or a paired t-test in the forum when I first started. I was the first to post about bootstrapping in the forum and nobody got it at the time (including me really). It took a while to get ML to work for me, and I have more than the average amount of interest.
I can remember when whether to use cross-validation or not was a HUGE controversy.
I don't think I would have been a quick enough learner—with a good set of features ready to plug into ML--to get it to work for me when I first signed up. I doubt I could have been able to stick with it and make it work for me had I started 10 years ago with the present AI/ML offering.
Also, advanced users might just stick with the API and not pay $50 every time they want to run a regression. The level of experience as well as the amount they are investing has to be just right for this to be a cost-effective solution for a member.
Oh is it $50 each time I want to do a regression? Maybe that makes a difference. Still…. has to make sense economically for all involved and regressions have no memory requirements—other than the coefficients—for prediction. I would let newbies use that at a reduced cost.
FWIW. Just my take on marketing to newbies and how quickly you can realistically expect it to work for them.
Jim