You think it's not reasonable? Then write your own Wolphram Alpha, if you really think it is that simple, and use that instead of WA for your work. Man, you have no idea what you are talking about here. Modern biology would be nowhere if people who build such "turing machines" were not credited for their work, and consequently get grants for their research.
For example, tons of software in bioinformatics is written with a completely open source and well known algorithms, using data gathered by experimentalists, and yet they get the recognition -- because someone had to come up the with the idea, gather (and maintain!) the data, run tests, implement, etc. etc. Believe me, even with simple ideas and algorithms and for simpler data sets this is a shitload of work. Heck, even re-implementations of existing tools get recognized.
Secondly, a scientific procedure requires that you publish your methods -- you have used software X to generate figure Y and table Z, then you have to write how you did it. And noone in her or his right mind will reimplement existing tools just for the sake of the current work without a very good reason.
That said, sometimes a tool like that allows you to "get on the trail" -- which you then pursue using something else. For example, WA would give you a hint that there might be a connection between cancer and, say, cigarettes, and you show this connection using clinical trials. In such a case, however, when you do not publish the data from WA directly, nor any figures derived from it, you are not required to cite it.
Note that I am in no way convinced that WA is of any use. The parts of it that overlap with my area of expertise (biology / biocomputing) are naive and rudimentary, and mostly useless to say the least.
j.