Because basically I'm a lazy arse who can't be bothered. I'll get a good deal from the pro on a full set anyway and the price for him to do it against the cost price (plus p&p) of doing it myself will probably be £20 tops. I'm happy to pay that. That said I've got £90 of vouchers to use so I might go the whole hog and get the woods and wedges all done with the irons anyway - it won't cost a bean then