I've used every cartridge system out there because each one promised to be better than the other. Eventually I gave up and went on a shaving hiatus for about 4 years. Except for the occasional and inevitable social event shave (if you have a SWMBO in your life you know what those are), I avoided shaving like a cat avoids water. Like the bathroom scene in Psycho, it drove fear into my heart. That was until last year when I joined this forum and discovered DE wetshaving for the first time. Once you get passed the initial investment on hardware it's like cruising down the highway off the California coast with your softtop down and the sun shining on you. Over the past year I've had to switch over to cartridge (Proglide) due to travel, and even using DE techniques my neck erupted with ingrown hairs.
If by "good shave you mean" irritation, redness, infections, etc. Then they sure do a good job at it. And yes, most companies are set up to make profits, and will sell you what they can "within reason". However, one thing I have learned about how this system works, is that they won't put on shelf what won't sell, and ultimately we as consumers make the decisions (hopefully well informed) and ultimately vote with our wallets.
That's my two cents....oh darn..anyone have change I can borrow to buy lunch (I'm two cents short).
Bejaar; "By failing to prepare, you are preparing to fail." -Benjamin Franklin