Since I will need a scopbin file loaded onto my server for the encoded scripts to work, won my customers also need a similar, if not the same, file?
Fortunately your customers will not need this file as they will just be viewing your web site, parsed through your server, which already is using scopbin. But if you want to sell your entire php script to someone, then yes, just give him/her the same scopbin folder with all other folders and files.