Sorry for all the confusion, KitKay. Don't feel bad, the intricacies of synching with iTunes is very, very confusing for anything other than the simplest situation.
Although you may find a way to get around the safeguards Apple has built in by signing in additional iPads into your iTunes account, I would not recommend it. You (or your co-workers) will run into problems as you continue to use your individual iPads without going through an incredibly complicated procedure to assure you (or they) don't lose data and/or apps in the future as they add/delete more applications.
Furthermore, keep in mind that apps maintain their own private data on the iPad. Thus, if you have, say, Pages on two iPads with different documents, you run the risk of overwriting one iPad's documents with those from another iPad.
All in all, it's just not worth the hassle.
I might suggest one approach that may be helpful to you or others. Most Apple Stores have a "small business specialist" whose job is to work with businesses who have several iPads (usually five or fewer.) They can arrange group purchases of apps and provide support specifically tailored to situations like yours. If you can't find such a specialist in a local Apple Store ask if they can give you a support number to call. You may be able to save some money on group purchases and resolve some of the issues of synchronization and information sharing you face.