An evening can confirm the route; how a subscriber figure behaves afterwards is a question for weeks.
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What a sample can establish is whether an order placed against your show arrives and whether the figure responds. Everything else people want to know about this particular metric unfolds across weeks, and a larger free batch would not compress it. The variable is time rather than quantity, and confusing the two produces most of the disappointment around tests like this.
Record the figure with the date range visible before ordering, wait a full day, and compare the identical range. Do not compare against a different window, and do not draw conclusions the same evening; the dashboard has not finished compiling by then.
One confirmed fact and several open questions. That is the normal ending for a demonstration. If you want to know how this figure behaves over a quarter, the only method is watching it for a quarter, and no sample substitutes for that.
Short answers to what people ask most before ordering.