OK think of it this way
Jon at Lips,Jamie at Sloth or Neil at Heaven(in no particular order) are generous enough to supply 5 brand new packs as a prize at a tourny,the team that wins them sells them for a quick buck on the forum so now 5 people who bought these prize packs are now not going to buy a pack from the said shop.So basically its has cost the shop 10 sales instead of 5.
If you win Free equipment at an event then why not, if you cannot use them due to sponsorship pass them on to another team who do not have the backing your team does.Just a thought !