vctenderness,
Access to the lounge at all airports. Better baggage allowance. Priority check in. Mileage points
Nope. Nope. Nope.... and Nope.
Let's go through them one by one shall we....
(a) Access to the lounge at all airports
If you're genuinely a business traveller, you'll almost definitely have frequent flyer card. Lounge access is one of the few perks of maintaining "status"... BA give you lounge access at both Silver and Gold tiers.... Silver tier is not hard to reach at all.
(b) Better baggage allowance
If you're a business traveller... who cares... you probably only ever travel with one suitcase.
And same again, you get extra baggage allowance as a frequent flyer perk.
(c) Priority check in
Comes with the card old chap'
(d) Mileage points
Not likely to mean much to a business traveller who has status already.
If you're talking about miles rather than status points, then it means even less....because for business travellers someone else will be picking up the tab, plus they get a bonus on mileage points as a frequent flyer card holder anyway.