```python
from typing import *
from collections import *

def value_keys(store: dict) -> dict:
    if store is None:
        raise ValueError("Store cannot be None")
    
    # Initialize a dictionary to hold counts of each value
    value_counts = defaultdict(int)
    
    # Iterate over each key-value pair in the store
    for item in store.values():
        # Increment the count for the current value
        value_counts[item] += 1
    
    return dict(value_counts)
```