I use mine daily, I'd be too tempted to binge if I was using them weekly. I think it's down to what suits you best really.
I use mine on chocolate, or ketchup, or whatever I fancy at the time. If I used a huge batch together on a binge, I would feel so restricted for the rest of the week!
I use to do them daily but now do them weekly, works a lot better for me.
I can knock syns for things I'm going to have threw the week but may not have all at once eg tub of coleslaw, bottle of wine thing like that and then use them at my leisure without measuring or weighing. At times I've done that and may find at the end of the week I've not had them all so infect have used less syns without trying.