sortedArrayUsingFunction doesn't sort properly

sortedArrayUsingFunction doesn't sort properly

Based on an NSMutableArray of NSMutableDictionarys, I try to sort it based
on a key by ascending order. the key is called Product Sale Price and it's
returned from server as a string like $350. So I substring the first
character to compare int values:
//Sorting function
NSInteger priceComparator(NSMutableDictionary *obj1, NSMutableDictionary
*obj2, void *context){
int v1 = [[[obj1 valueForKey:@"Product Sale
Price"]substringFromIndex:1] intValue];
int v2 = [[[obj2 valueForKey:@"Product Sale
Price"]substringFromIndex:1] intValue];
NSLog(@"v1, v2: %i | %i",v1,v2);
if (v1 > v2){
NSLog(@"v2 is smaller: <%i>",v2);
return v2;
}
else if (v1 < v2){
NSLog(@"v1 is smaller: <%i>",v1);
return v1;
}
else
return NSOrderedSame;
}
//Somewhere in the code
arrayProduct = (NSMutableArray*)[arrayProduct
sortedArrayUsingFunction:priceComparator context:nil];
NSLog(@"%@",arrayProduct);//The array is not sorted as expected, still
random order
So basically, the order is not affected somehow although I debugged that
step b step and all comparisons are correct. Am I missing something?
EDIT:
Here is some items of arrayProduct:
(
{
"Product ID" = 15119;
"Product Sale Price" = "$395";
},
{
"Product ID" = 16897;
"Product Sale Price" = "$75";
}
)