Thanks for the input.
I hadn't seen or heard of that first suggestion being used around here. Interesting.
That second one concerning the large blocks had occurred to me and I did ask about that with one guy but I can't recall right now what he told me.
In any case, I try to use herd phychology in areas that I don't have enough personal knowledge in. Firstly, 95% of the retaining walls around here are using Versa-Lock style blocks for both individuals and businesses. Secondly, by my observations there were basically 2 situations in which the large blocks were used and both of them had to do with large developements, with lots of heavy equipment already around to be used for the rest of the developement, in addition to the construction of the wall. I'm sure it's happened somewhere, but I have never observed an instance in which someone was hired after the fact to install the large blocks for either an individual or a business. I'm thinking there must be a reason. I don't know what the cost of the large blocks is but I do have an idea what the cost of the heavy equipment and manpower to deliver and move those blocks around might be. My wall, although large to me, is positively puny compared to some of the walls they build with the large blocks. It seems to me to be an economy of scale. There must be some break-even point in which it becomes cost effective to use the large blocks, with the extra associated equipment costs.
On the other hand, my Versa-Lock wall was constructed by 2 guys, using only a pick-up and a Bobcat. I have a pretty good idea on the cost of the blocks and, between the blocks, rock, fuel, & geo-grid that the builder had to pay for, I feel he only cleared at the most $3000-$5000 on a $15,000 job. That's not that bad when most home construction is figured on double the cost of materials.
Anyway, that was just my reasoning.