I'm aware that BA can't include functionality to save the betfair market data for use within the application, due to licencing issues. However, I'm also aware that Fracsoft provide historical data on an adhoc/per request basis. With this in mind, I think it would be a great marketing strategy to agree a BAMI (Bet Angel Market Import) file standard with Fracsoft which would allow BA users to purchase historical market data from a 3rd party provider. The user would then simply purchase the file via the BA UI and it would be imported into their *test markets* Guardian tab.
In terms of revenue share, that would be entirely up for grabs between you guys (tho i reality, perhaps the fact that this would allow BA to import market data would be enough of an incentive, rather than any revenue sharing model ,as it would potentially drive new customers to BA for this feature alone).
The benefits for the end user are obvious, but for clarity are listed below:
1. Ability to review the market activity after the event in order to gain insight to the mechanics of that market
2. Ability to replay a given market in order to fine tune automation rules, especially in the fast moving IR horse markets
3. Allows the end user to test manual scalping routines outside market trading hours. A valuable time as during market hours many are either working or actively involved in the markets
The additional benefits for BA developers would be that they could decouple the internals to allow them to test new functionality without the need for the live market to be in progress (tho potentially this is already the case

I for one would have no issue in paying a fair price for either a single BAMI file or a *set* for a given meeting etc, etc.
As a final word on this topic, BA could incorporate a static xml/json file per market type (out of the box) to allow end users to do all of the above mentioned, in order to test strategies etc, thus creating a taster of what the BAMI file import could do for real.
I think this is an exciting and lucerative way for BA to walk round the licencing issues and at the same time open up the potential for deep strategy testing for existing and new users (I can imagine a pretty funky marketing campaign on youtube showing the comparisons between BA and its lesser endowed relations

Hope this captures the collective imaginations out there - you know it makes sense!!.