wow fattie. I don't mean to sound rude or anything but....
I worked with a large horse vet for 6 years (and have owned horses for over 20yrs)... Not once have I ever heard of someone worming a horse as often as once a month. Especially if it is a senior horse. That would be a precursor to ulcers.
I'd get a second opinion, especially if you are being told to worm your horse this often by the same vet that is ripping you off blind. I feel that worming your horse so frequently with a standard worming paste will be quite detrimental to its health. If you are worming frequently, it should be done no more often than once every 8 weeks IMHO.. I personally am of the view that if you operate good pasture management, and dont take your horse out and about, you should not need to worm more than a few times a year.
It is dependent on the circumstance though.... and yours, I am not familiar with! So please don't take offence.
AND, on another point
It really shocks me to hear how bad things are in your country.... Australia really is the 'lucky country' (or are we just kidding ourselves!!!!) We are already rising our interest rates on a regular basis, and last month we sold the most new cars in history....
Yes horse feed is expensive ($12AUD for one bale of GRASS hay, $30AUD for one bale of lucerne!)... but we are sufferig nothing like you guys seem to be. It really saddens me to see what has happened to the economy through REAL peoples eyes (I work in finance)...
gosh... if you can't give away a horse like that... things must be bad...