Imagine you are a kitchen fitter. You're busy fittng a new kitchen at home because the missus says so. She has lots of friends and kitchens are improtant to them. She must have a kitchen worthy of a top 4 place in her little kitchen mini league. There's a lot of work to do because it's an old house, the walls aren't straight and there's more than a few cracks to fill. You've started, things are going ok but having spent a lot of money you encounter a problem with the electrics and the whole project stalls. The foundations are all there, the kitchen's been ordered, so much to the pleasure of the other half that you've even won a cup of your favourite coffeefrom her. No mean feat. You even got close to getting another one before the electrics blew.
teh dust settles on another week and you think right I've got the weekend to plan next weeks attack on the kitchen and get it up to scratch. Then the otherhalf can invite her firends over and they can compare kitchens. Yours will be in the top 4 for sure. Until that is the missus pulls the plug on you, stating you're not going to achieve the required goal in time for next weeks kitchen summit and has asked someone else in finish the job. They can change the spec slightly too.
Would you be happy to accept a role sourcing parts for the new kitchen fitter? I don't think so!