if i have 3 sites on 3 different domains that rank rather high with certain keywords, and i take all 3 sites and copy them into 1 large site with 1 domain, will the new site rank as high under the certain keywords as the 3 sites? how would this effect my sites? basically, i want to take the 3 sites i have in my sig, and make one large site out of them. keeping the same content/keyword, etc. just different domain name. then adding more and more content. but i'm afraid i'd lose my results for searches.
If you rank well for each of these sites don't change anything. Changing them will certainly cause at least a temporary drop in your rankings. Even if you do a 301 redirect you will still have issues as no redirect is perfect. If it ain't broke, don't fix it.
I wouldnt risk it if you are getting good rankings and traffic. Unless you think it will benefit your rankings and traffic better in the long run. Perhaps you should just look for less expensive hosting options.