I would not buy a silver age or newer book with tape because I think you can always find a copy without tape, in the same grade. Golden Age, I do not like tape but some books are so scarce or otherwise held onto in permanent collections that it may be your only choice. I hate brittle comics and I am not fond of restored yet I have a USA #6 that is slightly restored and a USA #8 that is slightly brittle. To put it in perspective, the USA #8 was G.A.tor's personal copy until he finally upgraded. If he had to "settle" for that then you know its a scarce book on the market! Sometimes, if you want a particular book badly enough and if it is rare, then you have to accept what comes around or just accept that you will never have a copy.
The one thing I still cannot get past is rusty staples with rust migration into the paper.