We have been ridge tilling since 1980. Ridge till is similar to strip till for many efficiencies and cost savings but less horsepower is required to ridge till, so I am quite confident in saying ridge till has the lowest cost per bushel of the tillage systems used today in corn / soybean production. Trouble with ridge till is it isn't the prettiest crop to look at in the summer time because of all the residue and not many like to cultivate anymore, most want to plant, spray and harvest.
Ridge till is different now than it was when it was more popular in the 80's. Back then most cultivated the corn twice and the soybeans at least once. Now days corn is only cultivated once and the beans not at all. So now a farmer can ridge till quite a few acres per cultivator and be very efficient. Most ridge tillers that I know have 12 and 16 row equipment. Alot of ridge till planters are pull type 16 row and some 24 row. Keeping the planter on the ridge used to be a challenge, but that was solved years ago with good guidance systems and now some using RTK to guide their planters and cultivators.
Banding P & K ( like the strip till guys) into the ridge is a efficient and excellent way to maximize your fertilizer dollars. 
I compared yields for many years to a very conventional farmer that farmed next to us on many of our farms, his corn yields were identical to ours, but 9 out of 10 years our soybean yields were much better. Not sure why, but soybeans love ridges.
Our plant populations are the same as conventional farmers in our area.

Hope I understood your question.