While I am not sure what sort of conversion you are looking for here, you should be able to do a calculated metric using nested IF statements and Greater Than or Equal To and Less Than or Equal To in order to form your "bucket"
Something like:
IF [
Logical Test [
Greater Than or Equal [
Metric X - Revenue
Metric Y - Static Number 30
]
]
Value_if_True [
IF [
Logical Test [
Less Than or Equal [
Metric X - Revenue
Metric Y - Static Number 1000
]
]
Value_if_True [
Value That You Need Here (Not sure if this should be a 1 for a purchase in this bucket? Or something that makes more sense to your conversion)
]
Value_if_False [
Static Number 0
]
]
]
Value_if_False [
Static Number 0
]
]