Pat- With perf cut your always cutting the same material. Stickers. You all can take it how you will but there are only 2 drawbacks to perf cutting with the Roland...
You will use more blades.
You will buy more cutting strips.
However, most die cut shops charge in excess of 300$ for a die to punch the paper on stickers.
It's quite easy to upsale your client, have a perf cut sticker handy and a sticker that's cut in a square by hand.... Say this one costs this much, the perf cut costs this much. You can easily mark up significantly per sticker to overcover the costs on blades and strips and 98% of the time the client will want perf because no other shop in town will be able to do it.