Considering that I purchased Aspdnsf ML in February 2007, and converted to DNN/ML, I am only aware of one site that is actually running DNN/ML on DotNetNuke. I will add that they are very close with version DNN/ML.7.0.0.7 as long as you are using an new install of DNN. I would not recommend installing it on a exisiting DNN system unless you are very confident of your abilities with DNN and ASPDNSF.

I have 7.0.0.7 working fine on a DNN 4.8.2 test site, expecting to go live in about two weeks (Mind you, I've said that many times already this year.)

I have a few questions for you and a few ideas as well.

Q1) What sites did you research that were running ASPDNSF on DNN?
Q2) Did you find out what environment they were running in and how they were hosted?
Q3) How did you determine better performance?

IMHO. if all you want to do is sell stuff on the website then choose ML. If you want DotNetNuke functionality and sell stuff then choose DNN/ML.

We all dream of millions of hits per day, but the reality is that performance should not be so high on the priority list. I can't tell you the number of times I've heard complaints about slow websites caused by very simple issues (imporoper configurations, multi MB tiff files, insufficient RAM, SQL Express Edition, home/office upload speeds, unmantained drives, unmanged backups, etc. etc.)

You can probably have an online store for on a shared host and shared SQL server ($10/month) but you can't expect google like performance. 

You can always upgrade to a virtual dedicated server ($50-$100/month), a dedicated server ($200-$500/month),  3 tier configuration ($850/month), n-tier ($1275/month), load balanced ($2500/month).

You get what you pay for in the Internet world too.