actually i read and posted an article a few months ago with egs of re-saved jpegs and there were
very minimal changes for( i think) it was the first 6-8 saves then you couldn't tell any difference what so ever( they had tested them by re-saving a number of times) the end result really was indistinguishable after more saves than i can image anyone doing in real life. and you can always rename the edited file anyway and really not have a great problem (which i do even with tiff files that i don't save as jpegs just to keep them straight). personally i would normally just work on a file till i finished it ( rather than open and close it repeatedly) but maybe others don't
could be wrong but i was under the impression jpegs are sharpened in camera, raw are not so if you are talking sharper straight from camera i don't know how that could be( from what i have read even the settings you might set in camera for raw are basically just added to the photo part of the file and only really added after processing but then again that would be something you adjusted ,not the basic raw file. I'm not sure when they are applied in post processing ie, if you are batch processing or your converter might add them before it puts up the thumbnail you may see those settings applied to the "raw" file but that wouldn't really be the "raw" file anymore,it would be an adjusted raw file) if you are talking after processing, well that is something you are doing also. I've also heard complaints from some that they don't shoot jpeg since they feel they are oversharpened, which of course would depend on what camera you are using and that would include dslrs. and so the jpeg/raw battle rages on....
imo raw covers a multitude of sins and for me, i don't see any reason
not to shoot in it but i know of a number of seasoned veterans that shoot in jpeg so i don't think the statement that "you should shoot in raw" necessarily is true...I'd change it to "you should learn enough to be able to use jpeg in some situations even if you choose to shoot in raw in others"

really i find the more i am used to shooting digital the less i
need to adjust the raw file. mostly i adjust exposure sometimes( i purposely have it set slightly under since imo my camera overexposes ) and apply sharpening, maybe crop. sometimes i apply a preset like grayscale or adjust saturation if i am going for a certain effect. but i have found that the more experience I get the less I
have to adjust.
not that this has anything to do with buying a dslr.....