OEV - and your point is? That we should just excuse / ignore this widespread venality and in some cases possible criminality ? That we should just tut tut, finger wag, shake our heads and sigh at yet more evidence of their little quirks?
That doesnt work for me, nor for a large majority of the electorate, judging from the responses / polls / quoted opinion.
Once more - these are publically elected representatives, more than adequately compensated with salary , pension, food and office allowances who nonetheless find it necessary to submit additional claims for a variety of services and items, ranging from cleaning and gardening to flat screen TVs and silk cushions dog food and horse s h i t, all paid for out of the public purse. It may well be a drop in the ocean when compared to the amount spent on Health, or Benefits, or whatever, but the scale of the offence does not excuse the offence itself.
Your comparison between sales reps and MPs is IMO hardly apt, since it is not comparing like with like for a start ( sales reps versus publically elected representatives dipping into the public purse).