I'm not yet in a position to collect Scrips, BUT I have been using Collectables as a source of gathering exp. If you check your Rowena Timers (its under the Timers, last thing on the list) you will see three things at the bottom of that window, in the Payment section : Base, and two Bonus. The Base tells you what the bare minimum Collectability rating they will accept for that item is, and the experience points / scrips you get for handing that in. Now, if your item's Collectability exceeds that of the Base range, then you fall into one of the two Bonus categories, which again tell you the requirement, and the rewards for handing that item in.