In my opinion, it is definite worth the investment of time and money. My initial order cost me $112.00. That got me syringes, blunt tip needles, bottles, 500ml of 10% nicotine (should last me several years), 250ml of both PG and VG, ten flavors and some other little things that I have forgotten. I then went to WalMart and picked up a fishing tackle box for all this stuff plus the stuff I got for making my coils (about $40 for the tackle box and $6 for the coil wire, my wife makes jewelry so we had the other stuff necessary for wire coils).
I have been making our juice for about two weeks now and am ordering some more flavors ($1.39 each for 8ml), about $20 worth which includes another 250ml of VG.
I did the math on one 15ml bottle of juice I made and it came out to about 3 cents per ml, counting just the expendable stuff I used (the PG, VG, Nic and flavors as I reuse all the hardware/equipment). Local B&M are charging anywhere between .80 to $1+ per ml.
Plus, as others have said, it is fun. I have finally produced a juice I like better than any I have purchased so far; a Blackberry/Raspberry flavor.