Yeah, few bargains in Amsterdam. In my opinion, Copenhagen is actually a cheaper city (drinking on the street is acceptable at least).
I must admit, I am staying for 8 days. First 3 I won't be smoking much, then 5 in the Bulldog Hostel. I know that whatever I say I will spend, I will spend much more - but I also know that I can curtail things a bit via the following:
1) Visiting the Albert Heijn and buying water, sweets, chocolate, fruit, maybe a couple of Belgian beers and some cold meats.
2) Eating the free breakfast at the Bulldog Hostel everyday.
3) Remembering that, generally, hash gets you a bit more bang for your buck.
4) That 4am joint doesn't really need to be 16E a gram shit. Nor the 8 am joint.
5) Having 1 1/4 papers for percy joints
6) Limiting bar visits to 1 visit each to
http://www.arendsnest.nl and the brewery
http://www.brouwerijhetij.nl/ - The Bulldog hotel has a happy hour where I can get a pint of La Chouffe for 3E so I'll probably be up for that at least once.
7) Visiting a couple of squat restaurants (we'll see how that goes, as they have limited time windows).
I reckon I will spend about 10 Euros a day in the AH, about 20 Euros a day for coffeeshop drinks/snacks/beers, and about another 10 on dinner - give or take. I think I will spend another 40-45 Euros on weed - e.g. 1g at 16, 1 at 12, hash at 15 say - I'm not beyond buying something a bit cheaper for the late-night smoke so I suspect I'll keep it down a bit. Maybe I can split some bags and do some wider sampling at the T&Ts, so that I get a better variety.
Truth of the matter is, if we had 2g of really good weed and 1g of good hash - a lot of us could eke that out over a very fun 2/3 days, mileage will vary obviously. You only live once, but a bit of perspective can be useful - especially if on a budget.