Why do so many games/application manufacturers insist on using a full screen installer???

After rebuilding a couple of boxes it has really got to me that half of the stuff I install tries to suck away your whole screen and a couple even try to stop you tabbing away!!!!

Can everybody please please please just use a nice small installshield type thingy that does the install in a little window and lets me carry on surfing, reading IRC, whatever while still being able to watch the installer so that I know when to swap disks.

kthanxbye