I have to agree with iluvmykids..If it's not broke,,don't fix it...
One of the biggest killers of someone who is doing business by dropshipping is that you have absolutly no control over the actual quality or shipping times of the items that you are selling...
And when something goes wrong, wether it be slow shipping,, product arriving and not working or not arriving at all,,, the customer is not going to be looking at the dropshipper, they are going to be looking at you for answers...And even though it will be something you had no control over, you are going to be the one that they blame...
So if you are making decent money with the way you're doing business right now, then stick with it..Don't get greedy, just take it slow and steady..Your business reputation (including customer relations) is a key factor in being successful in any business..So keep your reputation in your OWN hands....