You've received very good points to consider in replies so far. In addition to this you will possibly need to establish what they (the people who you are selling for) will expect to receive for each items and depending on condition and if it is new or used. I have experienced that people who are not familiar with selling online are likely to expect top dollar for items they can't sell offline.

Also if you're not familiar with the items that they are expert in then the expectations may be too high when it comes to pricing. You will need to be competitive with other sellers on Ebay or your product will probably not sell easily and and so therefor it will be a lot of work and time on your part and the sellers have lost nothing if you don't sell. I think it better to find something to sell that you are personally interested in.

Hope this helps.