Payment by resource doesn't work

[tschaffter]

I enabled the payment by resource (item ID 371 = gold nuggets).

Payment:
usePayment: true
byResources: true

Resources:
Item: 371
Prices:
toStation: 1

When I enter the command /dt travel , I start to travel even when I don't have gold nuggets on me. I would expect a warning message saying that I don't have the nuggets required to fly to . The same thing happens when I'm using the sign:

[DragonTravel]
Travel
Test
1

Is this happening because I'm an admin? I added to GroupManager config file "- -dt.nocost.*" (nocost permission removal) for me which could have been the reason why no payment is requested from me, but I can still fly for free.