hate to be a PARTY-POOPER, hah ahahah, but I always thought that betting to prices was as follows:

If the conveyance in question was rated at say.... 5-1,..... and at least those odds were on offer, i.e. say 7-1 was on offer /or available, then bet $20 per $100 required take out would be invested. Another example would be say 10-1 was available about the rated 5-1 chance , then the bet would still be $20. But NEVER in any circumstances would the loss (if any) be added to the target.